HTX Mark Price, Premium Index & Basis

Focused skill for mark price, premium index, and basis kline series on HTX USDT-M perpetuals. Mark price drives liquidation; premium index drives funding rate; basis = mark − index price (the spread vs spot reference). All public.

When to use this skill

Load this skill when the user asks about:

• "BTC mark price kline 4h"
• "Show me premium index for ETH-USDT"
• "Why is the mark price different from last trade?"
• "Premium index history before this funding settlement"
• "Mark price vs index price spread on SOL"
• "Is the perpetual trading at premium or discount?"
• "BTC basis history"

Underlying tool

Drives htx-cli. Binary on $PATH or $HTX_CLI_BIN. Always pass --json.